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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 02, 2020
Oct. 02, 2020
Sep. 27, 2019
Oct. 02, 2020
Sep. 27, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]            
Revenue, OTLs and STLs   $ 112 $ 108 $ 332 $ 320  
Revenue, remaining performance obligation $ 2,800 2,800   2,800    
Revenue, remaining performance obligation, expected satisfaction in next 12 months, percent 51.00%          
Revenue, remaining performance obligation, expected satisfaction in subsequent 12 months, percent 22.00%          
Contract with customer, asset, net $ 67 67   67   $ 77
Contract with customer, liability $ 1,300 $ 1,300   1,300   $ 806
Contract with customer, liability, revenue recognized       $ 537 $ 497